268 RESULTS OF THE METEOROLOGICAL OBSERVATIONS TAKEN DURING 



a good position near the maonetic hut. The following table gives particulars for the 

 period covered by the observations : — 



The mean hourly velocity of the wind, using the anemometer for the ten months June 

 1903 to March 1904, and converting the estimated force for April and May 1903 into 

 the equivalent in miles per hour, is Spring 13"9 miles. Summer 9 "8, Autumn 15 '4, 

 Winter 14"9 miles. 



Diurnal Variation in the Velocity of tlic Wind. 



Taking the values derived from the anemometer, we obtain the following means for 

 the hourly air movement at the different hours of the day (see Plate II.) : — 



Mean Aie Movement. — Miles per Hour. 



